Insecticides



Patented Jan. 1, 1952 UNITED STATES PATENT OFFICE XNSECTICIDES RoyCross, Kansas City, Mo.; Mary Forbes Cross and First National Bank 01'Kansas'City, executors of said Roy Cross, deceased No Drawing.Application April 13, 1945, Serial No. 588,247

(CaH4FCOOH) These are merely representative, DFDT and difiuor diphenyldichlorethylene being particularly effective.

While the methods of manufacture of many of these fluoro-phenyl productsare subject matter of separate inventions, the following is illus- Ytrative of typical reactions:

cchcno CCI=CH(CH4F)1 H20 Chloral DFDT As an example, difluorobenzenesmay be produced by the reaction of dichlorbenzenes with mercury fluorideor with antimony fluoride, for example:

2 C 5H5 F Fluorbenzene CQH4CI) H8]?! CQH4F: H2012 Orthodichlor- MercuryOrthodifluoro- Mercury benzene fluoride benzene chloride As anillustration of the yields in these and similar reactions in themanufacture of DFDT, 83% of a theoretical yield has been obtained. Inthe case of DFDT, a solution of to 2% is ordinarily used. This solutionmay be made up in petroleum naphtha or kerosene and then sprayed forinsects. In the case of flies, the number of flies killed is muchgreater than in the former insecticides of the type of pyrethrumsolutions. In each type of insecticide there is an optimum concentrationand an optimum condition for use. This is apparent to one skilled inhandling insecticides.

I claim:

1. An insecticidal composition of matter comprising the combination ofthe active ingredient 2 1,1 bis (p-fluorophenyl) 2,2,2 trichlorethane,and a carrier of a petroleum hydrocarbon solvent.

2. An insecticidal composition of matter containing 1,1 bis(p-fiuorophenyl) 2,2,2 trichlorethane as an active ingredient.

3. An insecticidal spray having 1,1 bis (p-fluorophenyl) 2,2,2trichlorethane therein as an active toxicant.

.4. An insecticidal composition comprising the combination of 1.1 bis(p-fluorophenyl) 2,2,2 trichlorethane as the active ingredient and acarrier miscible therewith.

ROY CROSS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 22,700 Muller Dec. 4, 19451,097,406 Erlenbach May 19, 1914 1,734,682 Lommel et al Nov. 5, 19292,267,587 Dreisbach et a1 Dec. 23, 1941 mama PATENTS Number Country Date333,583 Great Britain Aug. 15, 1930 446,935 Belgium Sept. 30, 1942 OTHERREFERENCES 0. S. R. D., Bimonthly Progress Report No. 22- Section1-Committee on Medical Research, Period ending Feb. 28, 1945, pages 1 to13, pages 9 and 13 especially pertinent. 167-OSRD.

Hansen-Distribution of a. Bromine Homologue of DDT," J. EconomicEntomology, volume

1. AN INSECTICIDAL COMPOSITION OF MATTER COMPRISING THE COMBINATION OFTHE ACTIVE INGREDIENT 1,1 BIS (P-FLUOROPHENYL) 2,2,2 TRICHLORETHANE, ANDA CARRIER OF A PETROLEUM HYDROCARBON SOLVENT.